Inventor
KIRKVOLD CHARLES F
5 patents
Patents
5 patentsUS4019575AApr 26, 1977
System for recovering viscous petroleum from thick tar sand
CHEVRON RES326 citations97
US3994340ANov 30, 1976
Method of recovering viscous petroleum from tar sand
CHEVRON RES316 citations97
US3994341ANov 30, 1976
Recovering viscous petroleum from thick tar sand
CHEVRON RES289 citations95
US4020901AMay 3, 1977
Arrangement for recovering viscous petroleum from thick tar sand
CHEVRON RES109 citations94
US4008765AFeb 22, 1977
Method of recovering viscous petroleum from thick tar sand
CHEVRON RES47 citations91